Your sensor is an I2C sensor. You can find information about the usage of an I2C sensor at https://github.com/Larsjep/monoev3/blob/release/MonoBrickFirmware/Sensors/HTColorSensor.cs. Other information about the adresses to be read etc. can be found in the official sourcecode for the NXC library: http://www.mindsensors.com/index.php?module=documents&JAS_DocumentManager_op=viewDocument&JAS_Document_id=198 (IMU-lib.nxc). The adress of the I2C sensor appears to be 0×22 as you can find in the demo (IMU-demo.nxc).